I used /scripts/cphulkdblacklist to blacklist an IP, 196.5.4.3. When I browse to the WHM interface of cpHulk, I see the IP has indeed been blacklisted. However, when I check the MySQL database, I cannot find the IP in the table "blacklist":

mysql> select IP from blacklist;
Empty set (0.00 sec)

mysql> select ISPREFIX from blacklist;
Empty set (0.00 sec)

If cpHulk does not store this blacklisted IP in the MySQL database, where does it store it?